code review 6198063: runtime: fix netbsd sigaction struct

src/pkg/runtime/signal_netbsd_386.c

 // Copyright 2009 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
 #include "runtime.h"
 #include "defs_GOOS_GOARCH.h"
 #include "signals_GOOS.h"
 #include "os_GOOS.h"
 
 extern void runtime·sigtramp(void);
 
 typedef struct sigaction {
         union {
-                void    (*__sa_handler)(int32);
-                void    (*__sa_sigaction)(int32, Siginfo*, void *);
-        } __sigaction_u;                /* signal handler */
-        uint32  sa_mask;                /* signal mask to apply */
+                void    (*_sa_handler)(int32);
+                void    (*_sa_sigaction)(int32, Siginfo*, void *);
+        } _sa_u;                        /* signal handler */
+        uint32  sa_mask[4];             /* signal mask to apply */
         int32   sa_flags;               /* see signal options below */
 } Sigaction;
 
 void
 runtime·dumpregs(Sigcontext *r)
 {
         runtime·printf("eax     %x\n", r->sc_eax);
         runtime·printf("ebx     %x\n", r->sc_ebx);
         runtime·printf("ecx     %x\n", r->sc_ecx);
         runtime·printf("edx     %x\n", r->sc_edx);
@@ skipping 89 matching lines @@
 
 void
 runtime·setsig(int32 i, void (*fn)(int32, Siginfo*, void*, G*), bool restart)
 {
         Sigaction sa;
 
         runtime·memclr((byte*)&sa, sizeof sa);
         sa.sa_flags = SA_SIGINFO|SA_ONSTACK;
         if(restart)
                 sa.sa_flags |= SA_RESTART;
-        sa.sa_mask = ~0ULL;
+        sa.sa_mask[0] = ~0U;
+        sa.sa_mask[1] = ~0U;
+        sa.sa_mask[2] = ~0U;
+        sa.sa_mask[3] = ~0U;
         if (fn == runtime·sighandler)
                 fn = (void*)runtime·sigtramp;
-        sa.__sigaction_u.__sa_sigaction = (void*)fn;
+        sa._sa_u._sa_sigaction = (void*)fn;
         runtime·sigaction(i, &sa, nil);
 }